Requisites For The Dark - Room. The dark - room is, or should be, the operator's pride, Hither he sends forth the wondrous mysteries which are to win him fortune and fame, and all depends upon his man-ners and manipulations therein. It should be supplied with every needful article, of the best quality, without stint, and kept everlastingly clean.
128. The dark - room should be arranged with the greatest can in it the sensitive plates are prepared, and the various delicate proc-esses which have to be guarded from daylight are performed. We are said that every ray of white light must be carefully excluded. It should bo conveniently arranged, so that the operator has ready at hand all the things be requires while manipulating, which he has to do as quickly as possible. A narrow table is fixed to the wall for supporting the sensitizing baths, which have to be placed in a somewhat inclined position. There should be a row of shelves for holding the bottles of collodion and other chemicals. It is well to have a sink near the table, with a tap above it for washing the proofs; this tap may be advantageously fitted with a piece of India-rubber tubing, having a rose at the end, so that the water may bo quickly and easily applied over a large surface.-G
For real comfort and convenience, I like one grand, large tank for the dark - room first in which I place all the smaller tank, as described by .Mr. Elbert Anderson in his excellent work. The real advantage of such large tank is this: It saves the floor from the splashings of the solutions and the consequent damage done to the plates by the raising of crystals in the air by the feet, which are sure to cause pin-holes. - G.W.Wallack.
Besids the required chemicals, we need a glass bath-holder for our sen-sitizing solution; a silver dipper for lowering the collodionized glass plate into the bath; pouring-bottles for collodion; developing-trays and bottles; draining-racks; graduated measures; funnels; a spirit-lamp; tanks; dishes; a goodly supply of water, and a multitude of minor use-ful articles, whose names and use will be explained at the proper time.
125. The ventilation of the dark-room is a matter which must be rigidly attended to. At the floor, openings a few inches high should he cut, the light kept out by inward strips, for the poisonous fumes usually work downward. A plan devised by Mr. Nelson K. Cherrill is shown by Fig. 35. It consists of a long box of any length required, with an opening(A b) all along the lower side of the front, and a similar one (OP) all along the upper side at the back. The two inward partitions (d d) are made, one extending from the bottom to within six inches from the top, the other from the top to within six inches of the bottom. The box is about eighteen inches square. The opening in front (a b) should be the same with the space left above and below d d, and also the same as the opening O p. The other spaces should be about the same, say six inches. There is a door at f; the passage of air is shown by the arrows. No light can enter, ss is intended for a zinc shade, fitted outside, to protect from the weather. Blacken the whole inside. One should be at the floor and one at the top of the dark - room, to suit all seasons. The scale of the drawing is inch to a foot.